Safety risk early-warning standard of foundation pit in complex environment during excavating

When in the vicinity of building or other complex conditions, the excavation safety risk warning standard need to be able to accurately quantify the associated economy and the environment safety of the project. Based on the risk theory, the design method of the excavation safety risk early-warning standard in the complex environment was put forward. To determine the design parameters, the probabilistic characteristics of the relationships between the risk warning indicator and ground deformation were analyzed. The interaction between building and foundation was studied by numerical analysis. Consequently, the relationships between building deformation parameters and risk early warning indicator were confirmed. The analysis method of damage to the building was proposed, and then, the design method of the safety risk early warning standard was determined. This design method is able to flexibly analysis the complex combinations of environmental factors. So it can over a wide range. With the classification warning mechanism, the dynamic early-warning standard can be designed during excavation. Confirmed by the practical engineering, the early-warning standard can more accordant to the engineering practice. ©, 2014, Academia Sinica. All right reserved.